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/*
* Copyright 2012 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Ben Skeggs
*/
#include "priv.h"
#include "regsnv04.h"
void
nv04_timer_time(struct nvkm_timer *tmr, u64 time)
{
struct nvkm_subdev *subdev = &tmr->subdev;
struct nvkm_device *device = subdev->device;
u32 hi = upper_32_bits(time);
u32 lo = lower_32_bits(time);
nvkm_debug(subdev, "time low : %08x\n", lo);
nvkm_debug(subdev, "time high : %08x\n", hi);
nvkm_wr32(device, NV04_PTIMER_TIME_1, hi);
nvkm_wr32(device, NV04_PTIMER_TIME_0, lo);
}
u64
nv04_timer_read(struct nvkm_timer *tmr)
{
struct nvkm_device *device = tmr->subdev.device;
u32 hi, lo;
do {
hi = nvkm_rd32(device, NV04_PTIMER_TIME_1);
lo = nvkm_rd32(device, NV04_PTIMER_TIME_0);
} while (hi != nvkm_rd32(device, NV04_PTIMER_TIME_1));
return ((u64)hi << 32 | lo);
}
void
nv04_timer_alarm_fini(struct nvkm_timer *tmr)
{
struct nvkm_device *device = tmr->subdev.device;
nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000000);
}
void
nv04_timer_alarm_init(struct nvkm_timer *tmr, u32 time)
{
struct nvkm_device *device = tmr->subdev.device;
nvkm_wr32(device, NV04_PTIMER_ALARM_0, time);
nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000001);
}
void
nv04_timer_intr(struct nvkm_timer *tmr)
{
struct nvkm_subdev *subdev = &tmr->subdev;
struct nvkm_device *device = subdev->device;
u32 stat = nvkm_rd32(device, NV04_PTIMER_INTR_0);
if (stat & 0x00000001) {
nvkm_wr32(device, NV04_PTIMER_INTR_0, 0x00000001);
nvkm_timer_alarm_trigger(tmr);
stat &= ~0x00000001;
}
if (stat) {
nvkm_error(subdev, "intr %08x\n", stat);
nvkm_wr32(device, NV04_PTIMER_INTR_0, stat);
}
}
static void
nv04_timer_init(struct nvkm_timer *tmr)
{
struct nvkm_subdev *subdev = &tmr->subdev;
struct nvkm_device *device = subdev->device;
u32 f = 0; /*XXX: nvclk */
u32 n, d;
/* aim for 31.25MHz, which gives us nanosecond timestamps */
d = 1000000 / 32;
n = f;
if (!f) {
n = nvkm_rd32(device, NV04_PTIMER_NUMERATOR);
d = nvkm_rd32(device, NV04_PTIMER_DENOMINATOR);
if (!n || !d) {
n = 1;
d = 1;
}
nvkm_warn(subdev, "unknown input clock freq\n");
}
/* reduce ratio to acceptable values */
while (((n % 5) == 0) && ((d % 5) == 0)) {
n /= 5;
d /= 5;
}
while (((n % 2) == 0) && ((d % 2) == 0)) {
n /= 2;
d /= 2;
}
while (n > 0xffff || d > 0xffff) {
n >>= 1;
d >>= 1;
}
nvkm_debug(subdev, "input frequency : %dHz\n", f);
nvkm_debug(subdev, "numerator : %08x\n", n);
nvkm_debug(subdev, "denominator : %08x\n", d);
nvkm_debug(subdev, "timer frequency : %dHz\n", f * d / n);
nvkm_wr32(device, NV04_PTIMER_NUMERATOR, n);
nvkm_wr32(device, NV04_PTIMER_DENOMINATOR, d);
}
static const struct nvkm_timer_func
nv04_timer = {
.init = nv04_timer_init,
.intr = nv04_timer_intr,
.read = nv04_timer_read,
.time = nv04_timer_time,
.alarm_init = nv04_timer_alarm_init,
.alarm_fini = nv04_timer_alarm_fini,
};
int
nv04_timer_new(struct nvkm_device *device, int index, struct nvkm_timer **ptmr)
{
return nvkm_timer_new_(&nv04_timer, device, index, ptmr);
}
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